<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>

        <el-card>
            <!-- 添加角色按钮区域 -->
            <el-row>
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>
            <el-table :data="roleList" boder stripe>
                <!-- 展开列 -->
                <el-table-column type="expand">
                    <template v-slot="scope">
                        <el-row
                            :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']"
                            v-for="(item1,i1) in scope.row.children"
                            :key="item1.id"
                        >
                            <!-- 栅格布局 -->
                            <!-- 渲染一级权限 -->
                            <el-col :span="5">
                                <el-tag
                                    closable
                                    @close="removeRightById(scope.row,item1.id)"
                                >{{item1.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 渲染二级和三级权限 -->
                            <el-col :span="19">
                                <!-- 通过for循环嵌套渲染二级权限 -->
                                <el-row
                                    :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']"
                                    v-for="(item2,i2) in item1.children"
                                    :key="item2.id"
                                >
                                    <el-col :span="6">
                                        <el-tag
                                            type="success"
                                            closable
                                            @close="removeRightById(scope.row,item2.id)"
                                        >{{item1.authName}}</el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <el-col :span="18">
                                        <el-tag
                                            :class="[i3 === 0 ? '' : 'bdtop']"
                                            type="warning"
                                            v-for="(item3,i3) in item2.children"
                                            :key="item3.id"
                                            closable
                                            @close="removeRightById(scope.row,item3.id)"
                                        >{{item3.authName}}</el-tag>
                                    </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                    </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作" width="300px">
                    <template v-slot="scope">
                        <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
                        <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
                        <el-button
                            type="warning"
                            icon="el-icon-setting"
                            size="mini"
                            @click="showSetRightDialog(scope.row)"
                        >分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>

        <!-- 分配权限的对话框 -->
        <el-dialog
            title="分配权限"
            :visible.sync="setRightDialogVisible"
            width="30%"
            @close="setRightDialogClosed"
        >
            <!-- 树形控件 -->
            <el-tree
                :data="rightsList"
                :props="treeProps"
                show-checkbox
                node-key="id"
                default-expand-all
                :default-checked-keys="defKeys"
                ref="treeRef"
            ></el-tree>
            <span slot="footer" class="dialog-footer">
                <el-button @click="setRightDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="allotRights">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            //定义所有角色列表数据
            roleList: [],
            //控制分配权限对话框的显示与隐藏
            setRightDialogVisible: false,
            //所有权限的数据
            rightsList: [],
            //树形控件的属性绑定对象
            treeProps: {
                label: "authName",
                children: "children"
            },
            //默认选择的节点Id值数组
            defKeys: [],
            //当前即将分配权限的id
            roleId: ""
        };
    },
    created() {
        this.getRolesList();
    },
    methods: {
        //获取所有角色的列表
        async getRolesList() {
            const { data: res } = await this.$http.get("roles");
            if (res.meta.status !== 200) {
                return this.$message.error("获取角色列表失败");
            }
            this.roleList = res.data;
        },
        //根据ID删除对应的权限
        async removeRightById(role, rightId) {
            //弹框用户是否要删除
            const confirmResult = await this.$confirm(
                "此操作将永久删除该文件, 是否继续?",
                "提示",
                {
                    confirmButtonText: "确定",
                    cancelButtonText: "取消",
                    type: "warning"
                }
            ).catch(err => err);

            if (confirmResult !== "confirm") {
                return this.$message.info("已取消本次操作");
            }

            const { data: res } = await this.$http.delete(
                `roles/${role.id}/rights/${rightId}`
            );
            if (res.meta.status !== 200) {
                return this.$message.error("删除权限失败");
            }

            role.children = res.data;
            return this.$message.success("删除成功");
        },
        //展示分配权限的对话框
        async showSetRightDialog(role) {
            this.roleId = role.id;
            //展示分配权限的对话框
            this.setRightDialogVisible = true;
            //获取所有权限的数据
            const { data: res } = await this.$http.get("rights/tree");
            if (res.meta.status !== 200) {
                return this.$message.error("获取权限数据失败");
            }
            this.rightsList = res.data;

            //递归获得三级权限Id
            this.getLeafKeys(role, this.defKeys);

            this.setRightDialogVisible = true;
        },
        //通过递归的形式，获取角色下所有三级权限的id，并保存到数组defKeys中
        getLeafKeys(node, arr) {
            //如果当前node节点不含children属性，则为三级权限
            if (!node.children) {
                return arr.push(node.id);
            }
            node.children.forEach(item => {
                this.getLeafKeys(item, arr);
            });
        },
        //监听分配权限对话框的关闭事件
        setRightDialogClosed() {
            this.defKeys = [];
        },
        //点击为角色分配权限
        async allotRights() {
            const keys = [
                ...this.$refs.treeRef.getCheckedKeys(),
                ...this.$refs.treeRef.getHalfCheckedKeys()
            ];

            const idStr = keys.join(",");

            const {
                data: res
            } = await this.$http.post(`roles/${this.roleId}/rights`, {
                rids: idStr
            });

            if(res.meta.status !== 200 ){
                return this.$message.error('更新权限失败')
            }

            this.$message.success('更新权限成功')
            this.getRolesList()
            this.setRightDialogVisible = false
        }
    }
};
</script>

<style lang="less" scoped>
.el-tag {
    margin: 7px;
}

.bdtop {
    border-top: 1px solid #eee;
}

.bdbottom {
    border-bottom: 1px solid #eee;
}

.vcenter {
    display: flex;
    align-items: center;
}
</style>